Oil-cooling system foe



l. I. METZGER.

O'IL COOLING SYSTEM FOR'EXPLOSIVE ENGINES. APPLICATION FILED APR. 4. 1919.

- 1,307,01 6. Patented June 17, 1919.

INVENTOR. fivm .LWZ er I ATTORNEY STATES. PATENT OFFICE.

IBVIN I METZGER', F STOCKTON, CALIFORNIA.

OIL-COOLING SYSTEM FOR EXPLOSIVE-ENGINES.

Specification of Letters Patent. Patented June 17, 1919.

Application filed April 4, 1919. Serial in. 287,605.

the same, reference being had to the accompanying drawin and to the characters of reference marke thereon, which form a part.

of this application.

This invention relates to improvements in an oil cooling system for explosive engines, and particularly to those used on trucks, tractors and other vehicles in which the engines work under heavy loads. The operation of an internal combustion engine is naturally conduciveto the generation of great heat. While a portion of this is carried off by the cooling water passing around the cylinders, a certain percentage remains in the metal and is conducted to the crank case, elther through the cylinder walls or through I the pistons and connecting rods. Also a certain percentage of the hot gases may leak past the piston intothe crank case. and other conditions heat the oil carried in the crank case to an excessive degree, so

.much so that the. oil loses its body while so heated and loses its value as a lubricant, particularly as the oil for heavy-duty motors should have considerable body.

The principal object of my invention,- therefore, is to produce .a means whereby the 7 oil in the crank case will be maintained at a reasonably low temperature while the engme is in operation.

The system may also be applied equally well to cool th oil in transmission boxes and the like, in which the constant revolving of gears tends to overheat the oil.

' designed.

A further object is to produce a simple system and yet one which will be exceedingly effective for the purposes for which it is These objects, I accomplish by means of such structure and relative arrangement of the parts as will fully appear by a perusal of the following specification and claims.

The on the drawing represents 8.

These. I

. usual crank case 2 therein adapted to contain a supply of oil.

Communicating with the case at the lowest point thereof is a pipe 3 having a strainer 4 thereon inside the crank case, the pipe leading to the intake of a pump 5 driven from the magneto or water pump shaft 6 of the.

motor, or by an auxiliary means if necessary.

The discharge pipe 7 from the pump leads to the top of a radiator 8, the same being cooled by means of a fan 9 driven by the motor in the usual manner. A return pipe 10 leads from the bottom of the radiator to the upper end of the crank case to discharge the cooled oil thereinto. This pipe must pass to the top of the radiator in order to keep the same full at all times.

In practice, this radiator may be made with the ordinary water radiator generally used and cooled by the same fan', orl it may be a separate radiator positioned on the vehicle'in'the most suitable location.

Thus from the foregoing description it will readily be seen that I hav'e'produced such a device as substantially fulfils the ob: jects of the invention'as set forth herein.

While this specification sets forth in detail a the present and preferred construction of the device, still in practice, such deviationsfrom such detail may be resorted to as do not form a departure from the spirit ofthe invention as defined by the appended claims.

Having described my invention, what I declare as new and useful and desire to secure by Letters Patent is 1. In comlbination with an inclosed casing containing oil subjected to heat, a means for 2. In combination with an explosive motor having a crank case thereon adapted to contain a supply of oil, a means for cooling the oil therein, such means comprisin a pipe connected at one end to the bottom 0 the easing, a radiator at the other end of the pipe, :1

fan positioned to cool the radiator, a second pipe leading from the radiator to the casing,

and a pump interposed in the first named pipe whereby a circulation of oil is maintained to cool the same, the pump and fan being driven by the motor. 1

In testimony whereof I afiix my signature.

IRVIN I. METZGE-R. 

